The Bubble Dome frame is made of non-corrosive, 100 % recyclable furniture grade PVC and PA6 materials. The frame has a UV additive in the mix to resist breakdown when exposed to prolonged sunlight. The transparent cover of the Bubble Dome is made of cold-resistant (-4°F) transparent soft PVC (650 gsm). Protecting it against excessive UV exposure and keeping it clean before storing will increase the life span of the cover.